Question

Can you represent the reduction of perchlorate to chloride by oxidation of `NO_2` to nitrate anion?

Answer 1

Well, `"perchlorate ion"` is reduced from `Cl(VII+)` to `Cl(-I)`....

Explanation:

`ClO_4^(-) + 8H^(+) + 8e^(-) rarr Cl^(-) + 4H_2O(l)` `(i)`

And `NO_2` is oxidized, `N(IV+)` to `N(V+)`:

`NO_2(g) +H_2O rarr NO_3^(-) +2H^(+) +e^-` `(ii)`

And so to eliminate the electrons, we take `(i) + 8xx(ii)`:

`8NO_2(g) +4H_2O+ClO_4^(-) rarr 8NO_3^(-) +8H^(+) + Cl^(-)`

Is this balanced with respect to mass and charge?